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Pension Plans Resulted in Net Pension Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension assets $ 159 $ 69
Other accrued liabilities (27) (31)
Accrued pension costs (2,014) (2,183)
Total (1,882) (2,145)
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 96 1,566
Accumulated benefit obligation 88 1,463
Fair value of plan assets 2 1,247
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 8,386 8,139
Accumulated benefit obligation 8,168 7,920
Fair value of plan assets $ 6,451 $ 6,252